package com.jie.server.common.controller;


import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.extra.servlet.ServletUtil;
import com.jie.common.config.ServerConfig;
import com.jie.common.constant.Constants;
import com.jie.common.result.R;
import com.jie.common.utils.StringUtils;
import com.jie.common.utils.file.FileUploadUtils;
import com.jie.common.utils.file.FileUtils;
import com.jie.server.common.exception.ServiceException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


/**
 * @description: 文件下载
 * @author: xiaojie
 * @since: 2024/12/17 0017
 */
@RestController
@RequestMapping(value = "common")
public class CommonController {


    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    private static final String FILE_DELIMETER = ",";

    private static final  String profile = "/templates/file/";

    /**
     * 下载 /templates/file/ 下文件 param fileName throws IOException
     */
    @GetMapping(value = "downloadFile")
    public void downloadFile(String fileName) throws IOException {

        if (StrUtil.isBlank(fileName)) {
            throw new ServiceException("不存在的文件：" + fileName);
        }
        //Resource resource = new ClassPathResource("templates/file/" + fileName);
        InputStream inputStream = this.getClass().getResourceAsStream("/templates/file/" + fileName);
        HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse();
        response.setCharacterEncoding("UTF-8");
        ServletUtil.write(response, inputStream,
                ObjectUtil.defaultIfNull(FileUtil.getMimeType(fileName), "application/octet-stream"), fileName);

    }


    /**
     * 通用下载请求
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request) {

        try {
            if (!FileUtils.checkAllowDownload(fileName)) {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = "download" + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete) {
                FileUtils.deleteFile(filePath);
            }
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }

    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public R uploadFile(MultipartFile file) throws Exception {

        try {
            // 上传文件路径
            String filePath =  "download";
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            Map map = new HashMap<>();

            map.put("url", url);
            map.put("fileName", fileName);
            map.put("newFileName", FileUtils.getName(fileName));
            map.put("originalFilename", file.getOriginalFilename());
            return R.ok(map);
        } catch (Exception e) {
            return R.error(e.getMessage());
        }

    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public R uploadFiles(List<MultipartFile> files) throws Exception {

        try {
            // 上传文件路径
            String filePath = "download";
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files) {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            Map map = new HashMap();
            map.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            map.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            map.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            map.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return R.ok(map);
        } catch (Exception e) {
            return R.error(e.getMessage());
        }

    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        try {
            if (!FileUtils.checkAllowDownload(resource)) {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = profile;
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

}
